Wavelength-converting wheel and projection apparatus

Abstract

A wavelength-converting wheel has a light incident side. The wavelength-converting wheel includes a disc, a heat conductive glue, a reflective layer, a plurality of protrusions, a heat conductive glue, and a wavelength-converting layer. The disc has an inner ring portion and an annular portion. The annular portion is connected to an outer edge of the inner ring portion. The annular portion includes a protrusion structure region. The protrusions are disposed in the protrusion structure region and protrude toward the light incident side. The heat conductive glue is disposed on the protrusion structure region. The reflective layer is disposed on the heat conductive glue. The wavelength-converting layer is disposed on the reflective layer and has a light receiving surface facing the light incident side.

What is claimed is: 
     
       1. A wavelength-converting wheel having a light incident side, and the wavelength-converting wheel comprising:
 a disc, having an inner ring portion and an annular portion, wherein the annular portion is connected to an outer edge of the inner ring portion, the annular portion comprises a protrusion structure region, and a plurality of protrusions are disposed in the protrusion structure region and protrude toward the light incident side; 
 a heat conductive glue, disposed on the protrusion structure region; 
 a reflective layer, disposed on the heat conductive glue; and 
 a wavelength-converting layer, disposed on the reflective layer and having a light receiving surface facing the light incident side. 
 
     
     
       2. The wavelength-converting wheel of  claim 1 , wherein the protrusion structure region comprises a central region, an inner region and an outer region, the inner region is disposed between the central region and the inner ring portion, the outer region is disposed on a side of the central region away from the inner region, the protrusions comprise a plurality of central protrusions, a plurality of inner protrusions, and a plurality of outer protrusions, the central protrusions are disposed in the central region, the inner protrusions are disposed in the inner region, and the outer protrusions are disposed in the outer region, and an arranged density of the central protrusions is larger than an arranged density of the inner protrusions and an arranged density of the outer protrusions. 
     
     
       3. The wavelength-converting wheel of  claim 2 , wherein the arranged density of the central protrusions is larger than 50% of an arranged density of the protrusions, and the arranged density of the inner protrusions and the arranged density of the outer protrusions both are less than 50% of the arranged density of the protrusions. 
     
     
       4. The wavelength-converting wheel of  claim 1 , wherein at least some of the protrusions extend toward the light incident side, penetrate through the heat conductive glue, the reflective layer and the wavelength-converting layer, and protrude out of the light receiving surface. 
     
     
       5. The wavelength-converting wheel of  claim 1 , wherein the protrusion structure region comprises a central region, an inner region and an outer region, the inner region is disposed between the central region and the inner ring portion, the outer region is disposed on a side of the central region away from the inner region, the protrusions comprise a plurality of central protrusions, a plurality of inner protrusions, and a plurality of outer protrusions, the central protrusions are disposed in the central region, the inner protrusions are disposed in the inner region, and the outer protrusions are disposed in the outer region, and the inner protrusions extend toward the light incident side, penetrate through the heat conductive glue, the reflective layer, and the wavelength-converting layer, and protrude out of the light receiving surface, the outer protrusions extend toward the light incident side, penetrate through the heat conductive glue, the reflective layer, and the wavelength-converting layer, and protrude out of the light receiving surface. 
     
     
       6. The wavelength-converting wheel of  claim 1 , wherein the protrusions are formed by stamping the disc. 
     
     
       7. The wavelength-converting wheel of  claim 1 , wherein the protrusions are formed by coating, printing, or sticking a metallic heat-conducting material on the disc. 
     
     
       8. The wavelength-converting wheel of  claim 1 , further comprising a plate, wherein the annular portion further comprises an optical region, the optical region is adjacent to the protrusion structure region, and the plate is disposed at the optical region and has a reflective surface facing the light incident side. 
     
     
       9. The wavelength-converting wheel of  claim 1 , further comprising a motor having a rotating shaft, wherein the inner ring portion is sleeved on the rotating shaft. 
     
     
       10. The wavelength-converting wheel of  claim 1 , wherein the heat conductive glue is disposed on the protrusion structure region, and is filled between the protrusions and above the protrusions. 
     
     
       11. A projection apparatus comprising:
 an illumination system, adapted to provide an illumination beam, and the illumination system comprising:
 an exciting light source, adapted to provide an excited beam; and 
 a wavelength-converting wheel, disposed on a transmission path of the excited beam, and a wavelength-converting layer of the wavelength-converting wheel, adapted to convert the excited beam into a converted beam, and the wavelength-converting wheel having a light incident side, and the wavelength-converting wheel comprising:
 a disc, having an inner ring portion and an annular portion, wherein the annular portion is connected to an outer edge of the inner ring portion, the annular portion comprises a protrusion structure region, and a plurality of protrusions are disposed in the protrusion structure region and protrude toward the light incident side; 
 a heat conductive glue, disposed on the protrusion structure region; 
 a reflective layer, disposed on the heat conductive glue; and 
 a wavelength-converting layer, disposed on the reflective layer and having a light receiving surface facing the light incident side; 
 
 
 a light valve, disposed on a transmission path of the illumination beam to convert the illumination beam into an image beam; and 
 a projection lens, disposed on a transmission path of the image beam. 
 
     
     
       12. The projection apparatus of  claim 11 , wherein the protrusion structure region comprises a central region, an inner region and an outer region, the inner region is disposed between the central region and the inner ring portion, the outer region is disposed on a side of the central region away from the inner region, the protrusions comprise a plurality of central protrusions, a plurality of inner protrusions, and a plurality of outer protrusions, the central protrusions are disposed in the central region, the inner protrusions are disposed in the inner region, and the outer protrusions are disposed in the outer region, and an arranged density of the central protrusions is larger than an arranged density of the inner protrusions and an arranged density of the outer protrusions. 
     
     
       13. The projection apparatus of  claim 12 , wherein the arranged density of the central protrusions is larger than 50% of an arranged density of the protrusions, and the arranged density of the inner protrusions and the arranged density of the outer protrusions both are less than 50% of the arranged density of the protrusions. 
     
     
       14. The projection apparatus of  claim 11 , wherein at least some of the protrusions extend toward the light incident side, penetrate through the heat conductive glue, the reflective layer and the wavelength-converting layer, and protrude out of the light receiving surface. 
     
     
       15. The projection apparatus of  claim 11 , wherein the protrusion structure region comprises a central region, an inner region and an outer region, the inner region is disposed between the central region and the inner ring portion, the outer region is disposed on a side of the central region away from the inner region, the protrusions comprise a plurality of central protrusions, a plurality of inner protrusions, and a plurality of outer protrusions, the central protrusions are disposed in the central region, the inner protrusions are disposed in the inner region, and the outer protrusions are disposed in the outer region, and the inner protrusions extend toward the light incident side, penetrate through the heat conductive glue, the reflective layer, and the wavelength-converting layer, and protrude out of the light receiving surface, the outer protrusions extend toward the light incident side, penetrate through the heat conductive glue, the reflective layer, and the wavelength-converting layer, and protrude out of the light receiving surface. 
     
     
       16. The projection apparatus of  claim 11 , wherein the protrusions are formed by stamping the disc. 
     
     
       17. The projection apparatus of  claim 11 , further comprising a plate, wherein the annular portion further comprises an optical region, the optical region is adjacent to the protrusion structure region, and the plate is disposed at the optical region and has a reflective surface facing the light incident side. 
     
     
       18. The projection apparatus of  claim 11 , wherein the heat conductive glue is disposed on the protrusion structure region, and is filled between the protrusions and above the protrusions.